Device for connecting pull rods to wrist pins



J. H. WILSON.

DEVICE FOR CONNECTING PULL RODS T0 WRIST PINS; APPLICATION FILEDJAN-18.1922- 1,4:12,54:8 Patented D 11, 1922.

UNITED STA TES PATENT OFFICE.

JOHN HART WILSON, OF BURKBURNETT. TEXAS.

, Specification of Letters Patent.

Patented" Apr. 11, 19122.

Application filed January 18, 1922. Serial No. 530,148.

To all whom it may] concern:

Be it known that 1, JOHN H. \Vrnsox, a citizen of the United States, andresiding at Burkburnett, -Wichita County, State of Texas, have inventedcertain new and useful Improvements in Devices for Connecting Pull Rodsto Wrist Pins, of which the following is a specification.

The present invention relates to devices for connecting theends of pullrods of oil well pumps to the crank or wrist pin of a driving engine orpower, unit.

in a well known arrangement of pumps in the oil fields it is frequentlydesirable to employ a single power unit, such as internal combustionengine, to furnish power necessary to operate pumping machinespositioned at severaldifferent'wells which are close to each other.Usually this power unit or engine is connected, at the mouth of onewell, directly to a pump positioned to lift the oil at that well and isconnected by chains, ropes or pull rods with one or more pumpspositioned at adjacent wells so that these several pumps aresimultaneously operated without necessitating the provision of a powerunit for each individual well.

Generally the power unit has been provided with a crank which rotates ina ver tical plane to which crank have been secured in various ways thepull rods or other linking devices connected to the adjacent pumps. Thepresent invention has particular reference to means for detachablyconnecting the ends of the pull rods to the crank of the power unit andits object is to provide, as an article of manufacture, a device whichmay be readily secured to a wrist pin of the engine crank and to whichin turn may be readily attached the ends of the pull rods, the method ofattachment being such that these rods may be readily disconnected. Thedevice is light in weight though amply strong and is preferably aone-piece casting which may be fabricated at low cost and yet which hasthe qualities necessarily possessed by such an article to accomplish itsfunction in a satisfactory manner.

The invention may be embodied in various forms one of which is disclosedin the following description when taken in connection with theaccompanying drawings in which:

Figure 1 is a plan view of the device positioned on a wrist pin andhaving two pull rods connected thereto;

Figure 2 is an enlarged plan view of the devlce;

Figure 3 is a side plan view of the device: and V Figure 1- is a sectionon line 1 4 of Figure 3. it

The shaft of an engine or power device is indicated at 10, a cranksecured thereonv at 11, and a wrist pin secured to the end of the crankat 12. Pull rods are indicated 13, 13, to the ends of which are securedhooks or catches 1 1, 1 1-, which in turn are detachably secured totheinember l) which is mounted for rotation on the wrist pin 12.

The member B has a hollow cylindrical portion 15 which is lined withbabbitt 16 or other antifriction metal. The wrist pin '12 of courseextends through and fits within this babbitt lining. Extending radiallyand in diametrically opposite directions from the central cylindricalportion 15 of member B are two arms or webs 17, 17, these websterminating in disk-like portions 18 which have circular apertures 19for the reception of the hooked ends of the catches 14, or for thereception of similar hooks or catches. It will be seen that theapertures 19 are not concentric with the outer peripheries of thecircular end portions 18. The thickness of metal between apertures 19,19 and the ends of member B is greater than the thickness of metalbetween. the apertures and the edges (Figure 2), this extra metal beingprovided to compensate for the wear which oc ours in the operation ofthe device due to the action of the catches 14:. The ends 15 of thecylindrical portion 15 extend beyond the edges of webs 17 and serve asspacing rings to prevent contact between the crank 11 and the portions18 of the webs, as the shaft and crank rotate.

As the crank 12 travels in a circular path' and as there is someresistance to this movement exerted at right angles to the pull rods,some lateral force will be exerted on the device which will tend to flexthe same and to break off the webs 17 from the portion 15. To strengthenthe device laterally transverse ribs or flanges 20 are provided at bothedges of the webs, these flanges serving to brace the webs from thecylinder 15. These transverse flanges are designed to provide an amplemargin of strength against laterally exerted forces.

Preferably the device just described is fabricated of cast steel whichprovides a maximum strength for a given weight of metal and a givencost. Other materials may be used, if desired, and the device may belined or unlined with babbitt as, thought best. It is possible toprovide a device of this character with more than two arms or webs 17 sothat instead of two pumps a greater number of suchpumps may be oper atedfrom a single power unit. In such cases the crank pin is, verticallydisposed andthe crank rotates in a horizontal plane. Other modificationsmay be devised without depart in from the spirit of the invention.

aving thus described my invention what I claim as new and desire tosecure by Let ters Patent is:

l. A device for connecting pull rods to wrist pins comprising aone-piece metallic memher having a hollow cylindricalportion to re ceivea wrist pin and armsextending outwardly from said cylindrical portion indiametrically opposite directions the ends of said arms being providedwith means to permit the attachment o'lfpull rods-thereto and thecylindical' portion extending axially beyond the arms in bothdirections, for the purpose-set forth.

2. A device "for connecting pull rods to wrist pins comprisingaone-piece metallic member having a cylindrical aperture to re ceiveawrist pin and arms extending outwardly from said cylindrical portion indiametrically opposite directions, the ends of said arms being providedwith eyes or apertures to receive the hooked ends of pull rod securingdevices, said eyes having thickened portions on the side remote from thecylindrical portion of the device, for the purpose set forth.

3. A device for connecting pull rods to wrist pins comprising aone-piece metallic member having a cylindrical aperture to receive awrist pin and radially extending arms provided with eyes to receive pullrod hooks or other fastening devices, and strengthening flanges disposedat right angles to the axis of the cylindrical opening and integral withsaid cylindrical portion and said arms, for

strengthening the arms against laterally exerted forces.

In testimony whereof I hereunto affix my signature.

JOHN HART WILSON.

